Oatey 53171 Rosin Core Wire Solder, 1/2 lb Lead free alloy of 95% tin and 5% antimony 450 450F - 464f melting range Designed for electrical/electronic work Rosin flux is contained within the core Lead Free Alloy of 95% Tin and 5% Antimony 450F - 464F melting range Designed for electrical/electronic work Rosin flux is contained within the core